Placer mining — (pronounced plass er ) refers to the mining of alluvial deposits for minerals. This may be done by open pit (also called open cast mining) or by various forms of tunneling into ancient riverbeds. Excavation may be accomplished using water… … Wikipedia
Lubricant — A lubricant is a substance introduced to reduce friction between moving surfaces. It may also have the function of transporting foreign particles and of distributing heat. The property of reducing friction is known as lubricity. A good lubricant… … Wikipedia
9/11 conspiracy theories — The collapse of the two World Trade Center towers and the nearby WTC7 (in this photo, the brown building to the left of the towers) is a major focus of 9/11 cons … Wikipedia
Mold growth, assessment, and remediation — Mold assessment and mold remediation are techniques used in occupational health: mold assessment is the process of identifying the location and extent of the mold hazard in a structure, and mold remediation is the process of removal and/or… … Wikipedia
Satellite — This article is about artificial satellites. For natural satellites, also known as moons, see Natural satellite. For other uses, see Satellite (disambiguation). An animation depicting the orbits of GPS satellites in medium Earth orbit … Wikipedia
Boeing WC-135 Constant Phoenix — WC 135 Constant Phoenix A WC 135 Constant Phoenix approaching a tanker Role Atmosphere Testing Related to Nuclear Incidents Ma … Wikipedia
Water purification — This article is about large scale, municipal water purification. For portable/emergency water purification, see portable water purification. For industrial water purification, see deionized water. For distilled water, see distilled water. Water… … Wikipedia
Winemaking — Wine grapes. Winemaking, or vinification, is the production of wine, starting with selection of the grapes or other produce and ending with bottling the finished wine. Although most wine is made from grapes, it may also be made from other fruit… … Wikipedia
Mathematics and Physical Sciences — ▪ 2003 Introduction Mathematics Mathematics in 2002 was marked by two discoveries in number theory. The first may have practical implications; the second satisfied a 150 year old curiosity. Computer scientist Manindra Agrawal of the… … Universalium
Nuclear weapons in popular culture — A nuclear fireball lights up the night in a United States nuclear test. Since their public debut in August 1945, nuclear weapons and their potential effects have been a recurring motif in popular culture,[1] to the extent that the decades of the … Wikipedia
United States Space Surveillance Network — Space surveillance is a critical part of United States Strategic Command s (USSTRATCOM) mission and involves detecting, tracking, cataloging and identifying man made objects orbiting Earth, i.e. active/inactive satellites, spent rocket bodies, or … Wikipedia
